ruby - Ruby 中的 %w{} 和 %W{} 大写和小写百分比 W 数组文字有什么区别？

Question

%w[ ]   Non-interpolated Array of words, separated by whitespace
%W[ ]   Interpolated Array of words, separated by whitespace

用法:

p %w{one one two three 0 1 1 2 3} # = > ["one", "one", "two", "three", "0", "1", "1", "2", "3"]
p %W{one one two three 0 1 1 2 3} # = > ["one", "one", "two", "three", "0", "1", "1", "2", "3"]
p %w{C:\ C:\Windows} # => ["C: C:\\Windows"]
p %W{C:\ C:\Windows} # => ["C: C:Windows"]

我的问题是……有什么区别？

Answer 1

%W 将字符串视为双引号，而 %w 将它们视为单引号(因此不会插入表达式或大量转义序列)。用 ruby​​ 表达式再次尝试你的数组，你会发现不同。

示例:

myvar = 'one'
p %w{#{myvar} two three 1 2 3} # => ["\#{myvar}", "two", "three", "1", "2", "3"]
p %W{#{myvar} two three 1 2 3} # => ["one", "two", "three", "1", "2", "3"]